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[1]XIE Ping,LONG Huaiyu,ZHANG Yangzhu,et al.Dominant Meteorological Factors of Spatiotemporal Variations of Seasonal Potential Evapotranspiration in Yunnan Province During the Period from 1981 to 2011[J].Research of Soil and Water Conservation,2017,24(02):184-193.

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Dominant Meteorological Factors of Spatiotemporal Variations of Seasonal Potential Evapotranspiration in Yunnan Province During the Period from 1981 to 2011

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 02 Page number: 184-193 Column: Public date: 2017-04-28

Title:: Dominant Meteorological Factors of Spatiotemporal Variations of Seasonal Potential Evapotranspiration in Yunnan Province During the Period from 1981 to 2011

Author(s):: XIE Ping^1,2, LONG Huaiyu¹, ZHANG Yangzhu², ZHANG Renlian¹; 1. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. College of Resources and Environment, Hu’nan Agricultural University, Changsha 410128, China

Keywords:: Yunnan Province; potential evapotranspiration; seasons; meteorological factors; sensitivity coefficient; contribution rate

CLC:: S161.4

DOI:: -

Abstract:: Based on the data of 52 meteorological stations in Yunnan Province from 1981 to 2011, we quantitatively analyzed the main factors affecting the change of seasonal potential evapotranspiration in each station by sensitivity coefficient and the contribution rate. The results show that:(1) the average temperature was the most sensitive variable for seasonal ET₀ in each station, and then followed by relative humidity, sunshine hours in spring, summer and autumn in the period from 1981 to 1990 and from 1991 to 2011, the sensitive of wind speed was the lowest; in winter, relative humidity was the most sensitive factor in a few stations; (2) the main factor of ET₀ change in most stations was different with seasons; from 1981 to 1990 in most stations, the determining factor of winter ET_0w was average temperature, and sunshine hours were the determining factor of other three seasons; from 1991 to 2011 in most stations, the ET₀ changed in summer mainly due to the sunshine hours, and other seasons were average temperature; (3) the spatial distribution patterns of main factors were different. The rise of average temperature was the dominating factor leading to the increase of winter ET_0w in the eastern region, and the sunshine hour was the main factor of summer ET_0e change in south-central area; in spring and summer, the regional diversity of the dominating factor was relatively obvious in different periods. The above results indicated that the dominating factor affecting the ET₀ in Yunnan Province had the characteristics of stage, season and region.

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